Vyn-All / Latham manufactures top-quality above-ground pool liners. Lasting quality guaranteed by materials like 100% virgin vinyl, unparalleled material strength and weather-resistance. 20 mil non-embossed high quality vinyl above ground pool liner. Vyn-All / Latham Liners are made in the U.S.A. Vyn-All / Latham uses computer-controlled automatic cutting machines to precisely cut the pieces of your liner from six-foot rolls of U.S. manufactured top-quality, 100% virgin vinyl. State-of-the-art high frequency dielectric RF sealing machines create a water-tight, lap-weld seal between the vinyl pieces. Computer-controlled automated welders affix the liner bead in one continuous seal around the top edge of the liner, creating the highest quality, water-tight seal possible. The floor of the liner is also attached using the same state-of-the-art processes and machinery. Finally, your liner is fan folded into its heavy-duty, double walled shipping carton. Fan folding ensures that your liner remains safe during shipping. It also ensures a quicker and easier installation.